title: Physiological stress of high NH (4) (+) concentration in water column on the submersed macrophyte Vallisneria Natans L.
abstract: The submersed macrophyte, Vallisneria natans L., was cultured in laboratory with NH (4) (+) -enriched tap water (1 mg L(-1) NH(4)-N) for 2 months and the stressful effects of high ammonium (NH (4) (+) ) concentrations in the water column on this species was evaluated. The plant growth was severely inhibited by the NH (4) (+) supplement in the water column. The plant carbon and nitrogen metabolisms were disturbed by the NH (4) (+) supplement as indicated by the accumulation of free amino acids and the depletion of soluble carbohydrates in the plant tissues. The results suggested that high NH (4) (+) concentrations in the water column may hamper the restoration of submersed vegetation in eutrophic lakes.
authors.affiliation: State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan, People's Republic of China.
authors.forename: Te
authors.initials: T
authors.lastname: Cao
authors.forename: Ping
authors.initials: P
authors.lastname: Xie
authors.forename: Zhongqiang
authors.initials: Z
authors.lastname: Li
authors.forename: Leyi
authors.initials: L
authors.lastname: Ni
authors.forename: Meng
authors.initials: M
authors.lastname: Zhang
authors.forename: Jun
authors.initials: J
authors.lastname: Xu
mesh_terms: D002244:Carbon / Q000378:metabolism; D063245:Plant Development; D010944:Plants / Q000187:drug effects* / Q000378:metabolism; D000644:Quaternary Ammonium Compounds / Q000633:toxicity*; D013312:Stress, Physiological; D014867:Water / Q000737:chemistry*
chemical_list: D000644:Quaternary Ammonium Compounds; D014867:Water; D002244:Carbon